10.1.1 The basic model
10.1.2 The first validation
10.1.3 User/Micropost associations
10.1.4 Micropost refinements
10.1.5 Content validations
10.2.1 Augmenting the user show page
10.2.2 Sample microposts
10.3.1 Access control
10.3.2 Creating microposts
10.3.3 A proto-feed
10.3.4 Destroying microposts